Driving device for the weft inserters of weaving machines with a fixed weft supply

ABSTRACT

A device for driving inserters of weft threads on fixed weft reserve looms having a rigid inserting element wherein electromagnetic organs made up of a rectilinear and horizontal stator, a mobile part carrying the inserter elements and a control element drive the inserters. The mobile part is preferably a grooved core of magnetic material having copper sheets placed in the grooves to form an armature so that the mobile part functions similarly to the rotor of an induction motor and carries one or two rigid inserter elements which are provided on their free ends with clamps or clips to catch the weft threads.

United States Patent l I I l l Inventor .10 Bass: Baslrt Calle Bailen, 150, Barcelona, Spain Appl. No. 854,061 Filed Aug. 29, I969 Patented July 6, 1971 Priority Aug. 29, 1968 Spain DRIVING DEVICE FOR THE WEFI INSER'I'ERS OF WEAVING MACHINES WITH A FIXED WEFI SUPPLY 6Claims,7DrawingFigs.

use: 139/123,

139/139 lnt.Cl ..D03d47/00 FieldofSearch 139/122- Primary Examiner-Henry S. Jaudon Attorney-Cushman, Darby & Cushman ABSTRACT: A device for driving inserters of weft threads on fixed weft reserve looms having a rigid inserting element wherein electromagnetic organs made up of a rectilinear and horizontal stator, a mobile part carrying the inserter elements and a control element drive the inserters. The mobile part is preferably a grooved core of magnetic material having copper sheets placed in the grooves to form an armature so that the mobile part functions similarly to the rotor of an induction motor and carries one or two rigid inserter elements which are provided on their free ends with clamps or clips to catch the weft threads.

PATENTED JUL 6197! SHEET 1 BF 3 I i lol ivz i/vrae 075.55 545.51 9 539.5018? PATENTEU JUL 6 I97! SHEET 2 UF 3 DRIVING DEVICE FOR THE WEFT INSERTERS OF WEAVING MACHINES WITH A FIXED WEFT SUPPLY Various systems of insertion of weft threads in the shed in looms, are known, the most usual being made up of shuttles which carry the pirns through the shed in a back and forth movement.

There are also shuttles which on their ends have clamps or driven from one side to the other of the loom, which on their free end have some clamps or clips for catching the weft thread coming from stationary bobbins. Within this design there is also known the type of two inserters driven from each side of the loom and which transfer the weft thread from one inserter to the other on their meeting in the center of the travel through the shed.

All said systems have various drawbacks, the most important being:

In the first and second cases, i.e., in the system in which the insertion of the weft is performed by means of shuttles carrying pirns or which on their end have clamps or clips, said shut ties are carried through the shed by jerks which cause deafening noises or a useless consumption of energy, in addition, limiting the velocity. Said shuttles can also be driven magnetically by electromagnets, which cause the movement of translation, but in this case the entire electromagnetic system has to be applied from underneath the shed, with the consequent friction of the shuttle on the warp threads'and an excessive increase of the mass of the batten, which in addition to increas ing the shaking of the machine, requires an increase of energy consumption. Further, since the magnetic circuit is closed by the air, as a result it gives a very low output and power factor.

Also the system of a closed circuit with a double stator forming the gap is known, whereby the shed is made to pass and in this zone there is performed the pass of a blade that is solid with the shuttle, for its translation, but this system has the drawback of it not being possible to apply a batten and regular comb, but it is necessary to substitute a device moved and placed ahead of the stator, which replaces the batten and comb, being made up of a shaft with a series of plates projecting like the teeth of a comb, which in synchronization with the pass of the shuttle, tighten the weft thread and are hidden below the lower layer of the warp threads.

This system has the drawback that the weft thread is located very far from line of formation of the cloth, the warp threads of the shed being those, which in their cross movement, caused by heddles, make said weft thread advance to the place where it is shoved by said blades, which in addition has the drawback that it is not possible to use threads that have adherence, nor very fine threads, it also not being possible to make with this system closely woven cloths or cloths for which two parallel shuttles have to be used.

Another drawback of the known electromagnetic driving of the shuttles consists in that, in case cloths are made with totally or partially metallic warp threads, there is an increase of rubbing with a tendency of some threads to stick to others due to the magnetic attraction.

In case of rigid inserters sent from one or both sides of the loom, without electromagnetic driving, there are required kinematic elements which in themselves are made up of complicated mechanisms and which as a general rule are heavy and expensive.

The device, the object of the present invention, in addition to solving all the drawbacks listed above, makes it possible to make two parallel cloths at the same time on the same loom, is very simple, occupies proportionally less space with relation to the looms that have rigid inserters driven by kinematic controls, and performs the function of insertion and withdrawal of the rigid inserter element, without other complementary elements located on the opposite side, and also the suitable braking of it forcatching and releasing of the weft thread on both sides of the loom, there being obtained suitable accelerations and decelerations of the inserter element in its rectilinear movement through the shed and, during this entire cycle, said inserter element being constantly controlled and in contact with the control device.

This control device of the inserter element is of the electromagnetic type and is made up of rectilinear and horizontal stator, made up of two lengthwise, vertical and parallel blocks with adequate separation between them to form the gap, the ends of the two blocks being united by yokes to make the closing of the magnetic circuit and one of the two blocks of said stator having on its inside face some grooves to house induction coils of the magnetic field.

In the gap and in the vertical position is housed a mobile part with a function similar to the rotor of a standard induction motor, said mobile part being made up of a core of magnetic material with grooves in which are placed copper sheets so as to form the armature. This mobile part carries the rigid inserter element, in the case of making only one cloth, or two rigid inserter elements, in case of making two parallel cloths at the same time on the same loom, provided on their free ends with clamps or clips to catch the weft threads.

For a better understanding of the invention, an embodiment is described below, with reference to the accompanying drawings.

In said drawings;

FIG. 1 is a hypothetical plane view of the loom unit with the magnetic control device of the inserter elements.

FIG. 2 is a hypothetical view in perspective of the unit made up of the stator-mobile part and inserter elements,

. FIG. 3 is a view in section along A-A of FIG. 1, of the stator-mobile part unit,

FIG. 4 is a hypothetical view in perspective of the mobile part with inserter elements,

FIG. 5 is a hypothetical view in perspective of the stator, showing the arrangement of the windings, the mobile part and guides being left out for greater clarity,

FIG. 6 is a hypothetical view in perspective of the control discs of the electric wiring, and

FIG. 7 is a diagram representing the electrical wiring.

In FIGS. 1 and 2, 1 represents the stator made up of two lengthwise, vertical and parallel blocks 2 and 3, joined by yokes 4 and 5 to form gap 6. In block 2 are some grooves to house induction field windings 7.

Mobile part 8 (FIG. 4) is made up of a core 9 of magnetic material, with grooves in which are introduced copper sheets 10 forming the armature, said mobile part 8 carrying on its free end (FIGS. 3 and 4) a part 12 to which are attached inserter elements 13 and 13 (FIG. 3). Said part 12 has two wings 14 and 15 of antifriction material which slide on two guides 16 and 17 which act as bearings. On end 18, opposite part 12, is attached another part 19 in the form of an H, fitted by its upper part to core 9 of mobile part 8 and in its lower part is housed a rod 20 of quadrangular section of antifriction material that slides on a guide 21 also acting as a bearing.

For a better understanding, we shall designate the three phases by R, S and T.

In FIGS. 5 and 7, there are represented by:

22, 22' and 22", three coils of winding 7, of the first phase R of stator I, connected in series,

23, 23' and 23", three coils of winding 7, of the second phase S of stator 1, connected in series, and

2 8, 24' and 24", three coils of winding 7, of the third phase T of stator, connected in series.

In FIG. 7, there are represented by:

25, 25', 25",26, 26' and'27, some bidirectional thyristors,

28 a complete wave rectifier bridge,

29. 30, 31 and 32 some thyristors,

33 the trigger device of the bidirectional thyristors 25 and 27,

34 the trigger device of bidirectional thyristors 25 and 25",

35 the trigger device of bidirectional thyristors 26 and 26,

36 the trigger device of thyristors 29, 30, 31 and 32,

37 the trigger control device,

U, V, W the terminals that form the center of the star,

48, 49 and 50 the wires belonging to a three-phase feed network, and 1' the control box.

In FIG. 6, there are represented by:

38, 39 and 44), some photoelectric cells,

41, 42 and 43 some lamps,

44 the drive shaft,

45, 46 and 47, the control discs,

45' and 45 notches of disc 45,

46 and 46" notches of disc 46, and

47 and 47 notches of disc 47.

Coils 22, 22, 22", 23, 23', 23", 24, 24 and 24" of each of the three phases R, S and T, which make up winding 7, are connected in series, phases R, S and T being connected together in a star.

The operation is as follows:

With mobile part 8 being located at the end closest to yoke 4, inserter elements 13 and 113, moved by said mobile part 8 by means of part 12, are completely outside the shed (FIG. 1

At this moment, each one of phases R, S and T of winding 7 of stator 1 is connected to a three-phase network made up of wires 48, 49 and 50, so that through this winding 7 pass threephase currents which create in gap 6 a magnetic field, which moves so that it moves mobile part 8 toward yoke 5, carrying with it inserter elements 13 and 113' and introducing them in their respective sheds, to the middle of the travel of mobile part 8 through stator 1 (FIG. 2), the first period of the cycle thus having occurred.

From this moment, or from the position of mobile 8 in the middle of its travel through stator 11, the connection of phases R and S are reversed, so that the magnetic field created moves in a direction opposite to the first magnetic field, which produces a deceleration of mobile part 8, until it has come close to the end of its travel, there occurring at this moment the second period of the cycle, at which time feeding of the three-phase current is interrupted and coil 22, closer to yoke 4, is passed through by a direct current, so that the created magnetic field tends to fix mobile part 8 in a determined position, slightly and automatically accelerating or decelerating it, depending on whether it is to be moved back or forward with respect to its desired synchronous position with the loom, the third period of the cycle being perfonned and the forward movement being completed of mobile part 8 carrying inserter elements 13 and 13', which at this moment are completely introduced in their respective sheds, remaining static during the fraction of a second necessary for catching of the weft threads.

After this fraction of a second, voltage is applied to winding 7 so that the magnetic field created accelerates mobile part 8 moving it toward yoke 4 to the middle of its travel through stator ll, thus forming the fourth period of the cycle. At the middle of this return travel of mobile part 8, the connection of phases R and S is reversed, so that the magnetic field created decelerates mobile part 8, at this moment the fifth period of the cycle being performed.

When mobile part 8 has gone a distance close to its starting point, or close to yoke 4, coil 24", closer accelerates mobile said yoke 4, is passed through by a direct current, so that the magnetic field created tends to fix mobile part 8 in a determined position, accelerating or decelerating it slightly and automatically, depending on whether it has to be moved back or forward, with respect to its desired synchronous position with the loom and keeping it in its extreme travel position a sufficient time for the release of the weft threads, the sixth and last period of the cycle thus being completed. In said position, inserter elements 113, 113 are kept completely outside the sheds (FIG. 1) so that crossings of the warp threads are produced by means of heddles 51 and 52 and the advance of batten 53 for striking home of the weft threads against the lines of formation of the cloths.

At this moment, a complete new cycle, exactly like the previous one, begins.

In the diagram shown in FIG. 7 of the electric wiring, is shown the equipment for control of coils 7 of stator ll, also shown in FIG. 5, but for clearer understanding of the function, reference is made only to FIGS. 6 and 7.

At the instant of starting said cycle, disc 45, keyed on shaft 44 of the loom, turns so that its notch 45 permits the passage of light from a lamp 41 which excites photoelectric cell 38, which sends a signal through 38' to control device 37, of a known system, which in turn sends a signal to trigger devices 33 and 34, which cause conducting to bidirectional thyristors 25, 25', 25" and 27.

Bidirectional thyristors 25, 25' and 25" connect the three phases R, S and T of winding 7 of stator 1 respectively to wires 48, 49 and 50 of a three-phase network. The bidirectional thyristor-27 permits closing of the center of the star.

The magnetic field, created when three-phase currents flow through the three phases R, S and T of winding '7, accelerates mobile part 8 in the direction already indicated to the middle of its travel through stator 1, i.e., the one corresponding to the first period of the cycle.

During this time, shaft 44 has turned so that disc 45 interrupts the passage of the light from lamp 4! to photoelectric cell 38, whereby control device 37 stops receiving the signal, as also trigger devices 33 and 34, nor do bidirectional thyristors 25, 25, 25 and 27 receive it; they stop conducting; the three phases R, S and T of winding 7 of stator 1 being disconnected Immediately afterwards, disc 46 turns so that its notch 46 permits passage of the light from lamp 42 to photoelectric cell 39, which sends a signal by 39' to control device 37, which in turn sends it to trigger devices 33 and 35, which cause the conducting of bidirectional thyristors 25, 26, 26' and 27, which connected phases R, S and T respectively to wires 48, 49 and 50. The magnetic field created now, by three-phase currents which flow through the coils 7 of stator ll, moves in the direction opposite to that it made before, thereby causing a deceleration of mobile part 8, corresponding to the second period of the cycle.

During this time, shaft 44 has turned so that disc 46 interrupts the passage of the light from lamp 42 to photoelectric cell 39, whereby control device 37 stops receiving the signal, as also trigger devices 33 and 35 nor do bidirectional thyristors 25, 26, 26' and 27 receive it; they stop conducting, the three phases R, S and T of winding 7 of stator R being disconnected.

Disc 47 turns so that its notch 47 permits passage of the light from lamp 43 to photoelectric cell 40, which sends a signal through 40' to control device 37, which in turn sends it to trigger device 36 and this latter to thyristors 29, 30, 311 and 32, causing them to conduct.

These thyristors 29,360,311 and 32 connected coils 22 and 24" to rectifying bridge 28 so that a direct current flows through these coils 22 and 24'.

Bidirectional thyristor 27 which now does not conduct current, is intended to impede the feeding of the rest of the coils of winding 7 through the center of the star.

Passage of the direct current through coil 22 creates a fixed magnetic field that produces on mobile part 8 the synchronizing effect described above and which corresponds to the third period of the cycle.

During this time, shaft 44 has turned so that disc 47 prevent the passage of the light from lamp 43 to photoelectric cell 44) and control device 37 stops receiving the signal, whereby it does not transmit it to trigger device 36, which does not transmit it to thyristors 29, 30, 31! and 32 which stop conducting.

Immediately afterward, disc 46 presents its notch 46" in front of lamp 42, permitting the passage of the light to photoelectric cell 39, actuating the entire system just as the second period of the cycle, but moving mobile part 8 in the opposite direction, to the middle of its travel through stator H, the fourth period the cycle thus being performed.

With the continuation of the turning of shaft 44, disc 45 has presented its notch 45" in front of lamp 4!, the passage of the light to photoelectric cell 38, the same process described in the first period of the cycle being repeated exactly, except mobile part 8 moves in the opposite direction, performing the fifih period of the cycle.

At the end of this fifth period of the cycle, notch 47" of disc 47 permits the passage of the light from lamp 43 to photoelectric cell 40, the same process as that of the third period of cycle being repeated exactly with the synchronizing effect on mobile part 8 of advance or going backward already described, inserter elements 13 and 13' being located completely outside the sheds, for releasing of the weft thread corresponding to each shed.

The details and constructive characteristics used to put in practice will be independent of the object of the percent invention, as any variant in the electric wiring or change of any element that is capable of it for a more correct application, all this remaining within the scope of the following claims.

I claim:

1. Device for driving inserters of weft threads on fixed weft reserve looms, of the type of those that comprise at least rigid inserting element characterized in that the inserter elements are driven by electromagnetic organs made up of a rectilinear and horizontal stator, a mobile part carrying the inserter elements and a control element.

vertical and parallel blocks, separated from one another, forming a gap and united at their ends by yokes to make the closing of the magnetic circuit, one of the blocks of said stator having on its inside face some grooves to house induction coils of the magnetic field.

3. Device according to claim 2, characterized in that in the gap of the stator and in the vertical position there is housed the mobile part, made up of core of magnetic material in which are inserted sheets of conductive of material so form the armature.

4. Device according to claim 3 characterized in that the mobile part comprises on its upper end a inserter element.

5. According to claim 1, characterized in that control element is made up of a shaft on which are keyed three discs, each with two notches, for the passage of the light from a lamp through the disc excite a photoelectric cell, also through each disc, for the control of the electrical wiring.

6. Device according to claim 2, characterized in that the magnetic field of the gap, is made up of three-phase currents that feed the coils of the stator, causing accelerations or decelerations of the mobile part and there being determined, by means of the change of the three-phase current by direct current in the two end coils of the stator, the exact position of the mobile part, in the stator at the entry and exit points of the 2. Device according to claim 1, characterized in that the inserting elements in the corresponding sheds rectilinear and horizontal stator is made up two lengthwise 

1. Device for driving inserters of weft threads on fixed weft reserve looms, of the type of those that comprise at least rigid inserting element characterized in that the inserter elements are driven by electromagnetic organs made up of a rectilinear and horizontal stator, a mobile part carrying the inserter elements and a control element.
 2. Device according to claim 1, characterized in that the rectilinear and horizontal stator is made up two lengthwise vertical and parallel blocks, separated from one another, forming a gap and united at their ends by yokes to make the closing of the magnetic circuit, one of the blocks of said stator having on its inside face some grooves to house induction coils of the magnetic field.
 3. Device according to claim 2, characterized in that in the gap of the stator and in the vertical position there is housed the mobile part, made up of core of magnetic material in which are inserted sheets of conductive of material so form the armature.
 4. Device according to claim 3 characterized in that the mobile part comprises on its upper end a inserter element.
 5. According to claim 1, characterized in that control element is made up of a shaft on which are keyed three discs, each with two notches, for the passage of the light from a lamp through the disc excite a photoelectric cell, also through each disc, for the control of the electrical wiring.
 6. Device according to claim 2, characterized in that the magnetic field of the gap, is made up of three-phase Currents that feed the coils of the stator, causing accelerations or decelerations of the mobile part and there being determined, by means of the change of the three-phase current by direct current in the two end coils of the stator, the exact position of the mobile part, in the stator at the entry and exit points of the inserting elements in the corresponding sheds. 